Struct DataSet 

pub struct DataSet {
    pub schema: Schema,
    pub rows: Vec<Vec<Value>>,
}

In-memory tabular dataset.

Rows are stored as Vec<Vec<Value>> in the same order as the Schema fields.

Fields

schema: Schema

Schema describing row shape.

rows: Vec<Vec<Value>>

Row-major value storage.

Implementations

impl DataSet

pub fn new(schema: Schema, rows: Vec<Vec<Value>>) -> Self

Create a dataset from schema and rows.

pub fn row_count(&self) -> usize

Number of rows in the dataset.

pub fn filter_rows<F>(&self, predicate: F) -> Self

where F: FnMut(&[Value]) -> bool,

Create a new dataset containing only rows that match predicate.

The returned dataset preserves the original schema.

pub fn map_rows<F>(&self, mapper: F) -> Self

where F: FnMut(&[Value]) -> Vec<Value>,

Create a new dataset by applying mapper to every row.

The returned dataset preserves the original schema.

Panics

Panics if mapper returns a row with a different length than the schema field count.

pub fn reduce_rows<A, F>(&self, init: A, reducer: F) -> A

where F: FnMut(A, &[Value]) -> A,

Reduce (fold) all rows into an accumulator value.

This is similar to Iterator::fold, but provides each row as &[Value].

Trait Implementations

impl Clone for DataSet

fn clone(&self) -> DataSet

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DataSet

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for DataSet

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for DataSet

fn eq(&self, other: &DataSet) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for DataSet

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for DataSet